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t <br />lect the Dwyer Magnehelic"' gage for high accuracy — guaranteed <br />thin 217c of full scale — and for the wide choice of 81 ranges avail - <br />le to suit }our needs precisely Using Dwyer's simple, frictionless <br />Magnehelic" movement it quickly indicates low air or non-corro- <br />as pressures --either positive, negative (vacuum) or differen- <br />h- design resists shock, vibration and over -pressures No <br />anometer fluid to evaporate, freeze or cause toxic or leveling prob- <br />lems Its inexpensive, too <br />idely used to measure fan and blower pressures filter resistance, <br />RIr velocity furnace draft pressure drop across orifice plates liquid <br />t <br />eels with bubbler s3 stems and pressures in fluid amplifier or fluidic <br />systems it also checks gas -air ratio controls and automatic valves <br />nd monitors blood and respiratory pressures in medical care <br />uipment <br />-7)OUflting A single case <br />e is used for most ranges _ <br />Magnehelic gages They t <br />[4W� <br />be flush or surface -� <br />nted with standard Flush Surface Or Pipe Mounted <br />ware supplied With the <br />nal A-510 Pipe Mounting Kit they may be conveniently Installed on hon <br />or vertical ly.'-2" pipe Although calibrated for vertical position many ranges <br />1 inch may be used at any angle by simply re zeroing However for maximum <br />acy they must be calibrated In the same position in which they are used These <br />cterlstics make Magnehehcgages ideal for both stationaryand portable applications <br />hole is required for flush panel mounting Complete mounting and connection <br />s plus instructions are furnished with each instrument <br />Vent valves <br />In applications where pressure is continuous and the Magnehelic <br />gage is Connected by metal of plastic tubing which cannot be <br />easily removed we suggest using Dwyer A 310A vent valves to <br />connect gage Pressure can then be removed to check or re zero <br />the gage <br />HIGH AND MEDIUM PRESSURE MODELS <br />Installation is similar to standard gages except that a 4i✓." hole Is <br />- needed for flush mounting The medium pressure Construction is <br />rated for Internal pressures up to 35 psigand the high pressure up <br />to 80 pslg Available in all ranges Because of larger case will not <br />fit in portable case weight 1 tb 10 oz (Installation of the A 321 <br />safety relief valve on standard Magnehelic gages often provides <br />adequate protection against infrequent overpressure see Bulletin <br />S 1011 <br />PHYSICAL DATA <br />Ambient temperature range 20' to 1400E ' <br />Rated total pressure —20' Hg to 15 pslg 1 <br />Connections Ve' NPT high and low pressure taps <br />duplicated — one pair side and one pair on back <br />Housing Die cast aluminum Case and aluminum <br />parts Indite dipped to withstand 168 hour salt spray <br />test Exterior finish Is baked dark gray hammerlofd <br />Standard ranges See facing page <br />Accuracy Plus or minus 2% of full scale (3% on -0 <br />and 4"0 on -00 ranges) throughout range at 70'F <br />Standard accessories Two arta-NPT plugs for duplicate pres <br />sure taps two +rs pipe thread to rubber tubing adapters and <br />three flush mounting adapters with screws (Mounting ring <br />and snap ring retainer substituted for 3 adapters In MP & HP <br />gage accessories ) <br />Weight I lb 2 oz <br />Low temoeralure models available as special option <br />For applications with nigh cycle rate within gage total Pres <br />sure raling next higher fating is recommended See <br />tedium and w gh pressure options at lowef left <br />OPTIONS AND ACCESSORIES <br />Transparent overlays <br />Furnished on red and green to high <br />- tight and emphasize criticat pressures <br />Adjustable signal flag <br />Integral with plastic gage cover has <br />external reset screw Available for all <br />ranges (not high pressure) Can be or <br />dered with gage or separately <br />Portable units <br />Combine carrying case with any Mag <br />nehelic gage of standard range (not <br />high pressure) Includes 9 ft of Xt' 1 1) <br />{ rubber tubmg, stand hang bracket, and <br />terminal tube with bolder <br />Air fitter gage accessory package i <br />Adapts any standard Magnehelic to <br />use as an air filler gage Includes alu <br />mmum surface -mounting bracket with <br />^^ screws two S ft lengths of V. alumi- <br />U-r num tubing, two static pressure lips <br />and two molded plash, vent valves <br />integral COmpreSSiOn littengs on both <br />iii -- Ops and valves <br />